998  
FOUS54 KMEG 150921  
PFWMEG  
 
FIRE WEATHER POINT FORECAST MATRICES  
NATIONAL WEATHER SERVICE MEMPHIS TN  
421 AM CDT MON AUG 15 2022  
 
MSZ002-152200-  
WINBORN NFDRS SITE-MARSHALL MS  
34.69N 89.30W ELEV. 500 FT  
421 AM CDT MON AUG 15 2022  
 
DATE MON 08/15/22 TUE 08/16/22 WED 08/17/22  
UTC 3HRLY 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00  
CDT 3HRLY 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19  
 
MAX/MIN TEMP 93 69 91 69 82  
TEMP 74 86 92 93 87 77 74 70 70 80 87 90 85 76 73 70 69 75 80 81 77  
DEWPT 69 73 70 69 68 69 68 67 68 69 67 67 68 68 68 67 68 70 71 70 70  
MAX/MIN RH 46 97 47 97 69  
RH 84 65 49 46 53 76 82 90 93 69 52 47 57 76 84 90 97 84 74 69 79  
WIND DIR W W NW NW N N NE NE NE E N NE NE NE NE E E E N N N  
WIND SPD 2 5 10 12 6 3 2 2 2 3 5 6 5 2 2 2 2 4 4 5 5  
CLOUDS SC SC SC SC FW FW SC FW FW FW SC SC SC SC SC B1 B2 B2 B2 B1 B1  
CLOUDS(%) 39 33 32 31 23 20 32 20 17 25 38 28 31 31 45 59 78 77 72 58 63  
POP 12HR 10 5 20 40 70  
QPF 12HR 0 0 0 0.31 0.58  
RAIN SHWRS IS IS IS IS IS IS SC SC NM NM NM NM SC  
TSTMS IS IS IS IS IS SC SC SC SC SC SC SC  
T WIND DIR SW W W NW N N NE NE NE W N NE NE NE NE NE E NE N N N  
T WIND SPD 3 17 17 16 12 12 13 4 3 2 5 4 11 6 11 8 8 9 9 9 10  
MIXHGT M AGL 1433 1513 249 24 1242 1414 273 120 527 518  
MIXHGT FT AGL 4700 4964 818 79 4074 4638 896 395 1729 1701  
MIXHGT M MSL 1554 1635 371 146 1364 1536 395 242 649 640  
MIXHGT FT MSL 5100 5364 1218 479 4474 5038 1296 795 2129 2101  
TRANSWIND DIR W NW NE NE W NE NE NE NE N  
TWIND SPD M/S 6 6 5 3 1 3 4 4 4 4  
TWIND SPD MPH 14 14 11 6 3 6 9 9 9 9  
VENT INDEX 11445 2480 3072 1936 2596  
CATEGORY DAY 4 2 2 1 2  
500M MIXHGT T 87 89 83 78 80 86 85 81 73 73  
500M TWND DIR W NW NE NE NE E E SE E NE  
500M TWND M/S 6 5 8 7 1 2 5 7 5 6  
500M TWND MPH 14 12 18 17 3 5 12 17 12 13  
DISPERSION 49 22 12 10 15 5 10 11 19 7  
LAL 1 1 1 1 2 2 3 3 3 3  
LASI 4 4 4 4 4 4 3 3 3 3  
STABILITY B C F E A C F E B B  
STAG INDEX 3 3 3 3 1  
 
DATE THU 08/18/22FRI 08/19/22SAT 08/20/22SUN 08/21/22  
UTC 6HRLY 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00  
CDT 6HRLY 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19  
 
MIN/MAX TEMP 66 82 67 85 67 88 69 86  
TEMP 69 66 79 80 69 67 83 81 69 69 86 83 71 69 85 79  
DEWPT 69 66 68 67 67 67 67 67 69 68 68 68 69 68 70 70  
RH 100100 69 65 93100 59 63100 97 55 61 93 97 61 74  
WIND DIR NE NE NE NE SE SW S SW  
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15  
AVG CLOUDS B1 B1 SC SC SC SC SC SC SC FW SC SC SC SC B1 SC  
POP 12HR 40 20 10 20 10 20 20 30  
RAIN SHWRS SC SC IS IS IS IS IS IS IS SC  
TSTMS SC IS IS IS IS IS SC  
 

 
 
BELOW IS A WEATHER ELEMENT KEY FOR THIS PRODUCT  
 
DAY 1 THROUGH 3...  
 
MAX/MIN TEMP OR MIN/MAX TEMP (F)....MAXIMUM/MINIMUM AIR TEMPERATURE  
TEMP (F)............................AIR TEMPERATURE  
DEWPT (F)...........................DEW POINT TEMPERATURE  
MIN/MAX RH OR MAX/MIN RH (%)........MAXIMUM/MINIMUM HUMIDITY  
RH (%)..............................RELATIVE HUMIDITY  
WIND DIR (8 POINT COMPASS)..........20 FT. WIND DIRECTION  
WIND SPD (MPH)......................20 FT. WIND SPEED  
WIND CHILL (F)......................WIND CHILL  
HEAT INDEX (F)......................HEAT INDEX  
CLOUDS (CAT)........................CLOUD COVER CATEGORY  
EXAMPLE: CL = CLEAR; FW = FEW; SC = SCATTERED;  
B1 = MOSTLY CLOUDY; B2 = CONSIDERABLE CLOUDS; OV = OVERCAST  
CLOUDS (%)..........................CLOUD COVER AS A PERCENTAGE  
POP 12HR (%)........................PROBABILITY FOR ACCUMULATING PRECIPITATION  
QPF 12HR (IN).......................LIQUID EQUIVALENT PRECIPITATON AMOUNT  
WEATHER...  
TYPE...  
RAIN...........RAIN  
RAIN SHWRS.....RAIN SHOWERS  
TSTMS..........THUNDERSTORMS  
DRIZZLE........DRIZZLE  
SNOW...........SNOW  
SNOWSHWRS......SNOW SHOWERS  
SLEET..........SLEET  
FLURRIES.......FLURRIES  
FRZG RAIN......FREEZING RAIN  
FRZG DRZL......FREEZING DRIZZLE  
COVERAGE...  
IS.............ISOLATED  
SC.............SCATTERED  
NM.............NUMEROUS  
O..............OCCASIONAL  
S..............SLIGHT CHANCE  
C..............CHANCE  
L..............LIKELY  
WD.............WIDESPREAD  
D..............DEFINITE  
AR.............AREAS  
PA.............PATCHY  
OBVIS...............................OBSTRUCTION TO VISIBILITY  
TYPE...  
F..............FOG  
PF.............PATCHY FOG  
+PF............PATCHY DENSE FOG  
F+.............DENSE FOG  
H..............HAZE  
BS.............BLOWING SNOW  
K..............SMOKE  
BD.............BLOWING DUST  
MIXHGT M AGL........................MIXING HEIGHT IN METERS ABOVE GROUND LEVEL  
MIXHGT FT AGL.......................MIXING HEIGHT IN FEET ABOVE GROUND LEVEL  
MIXHGT M MSL........................MIXING HEIGHT IN METERS MEAN SEA LEVEL  
MIXHGT FT MSL.......................MIXING HEIGHT IN FEET MEAN SEA LEVEL  
TRANSWIND DIR (8 POINT COMPASS).....TRANSPORT WIND DIRECTION  
TWIND SPD MS (M/S)..................TRANSPORT WIND SPEED IN METERS PER SECOND  
TWIND SPD MPH (MPH).................TRANSPORT WIND SPEED IN MILES PER HOUR  
VENT INDEX (M2/S)...................VENT INDEX IN METERS SQUARED PER SECOND  
CATEGORY DAY........................CATEGORY DAY BASED ON VENT INDEX  
EXAMPLE: 1 = <2000; 2 = >=2000 AND <4000; 3 = >=4000 AND <8000;  
4 = >=8000 AND <16000; 5 = >=16000  
500M MIXHGT T (F)...................SURFACE TEMPERATURE NEEDED TO CREATE MIXING  
UP TO 500 METERS ABOVE THE GROUND  
500M TWND DIR (8 POINT COMPASS).....TRANSPORT WIND DIRECTION AT 500 METERS AGL  
500M TWND M/S.......................TRANSPORT WIND AT 500 METERS AGL IN M/S  
500M TWND MPH.......................TRANSPORT WIND AT 500 METERS AGL IN MPH  
DISPERSION..........................DISPERSION INDEX FOR SMOKE DISPERSION  
EXAMPLE: 1-6 = VERY POOR; 7-12 = POOR; 13-20 = GENERALLY POOR  
21-40 = FAIR; 41-60 = GENERALLY GOOD; 61-100 = GOOD  
101+ = EXCELLENT  
LAL.................................LIGHTNING ACTIVITY LEVEL  
EXAMPLE: 1 = NO THUNDERSTORMS; 2 = ISOLATED THUNDERSTORMS  
3 = WIDELY SCATTERED THUNDERSTORMS; 4 = SCATTERED THUNDERSTORMS  
5 = NUMEROUS THUNDERSTORMS; 6 = DRY LIGHTNING WITH NO RAIN  
LASI (SAME AS HAINES INDEX).........LOWER ATMOSPHERIC SEVERITY INDEX  
MEASURES FIRE GROWTH POTENTIAL  
EXAMPLE: 1-3 = VERY LOW; 4 = LOW; 5 = MODERATE; 6 = HIGH  
STABILITY...........................STABILITY CLASS  
EXAMPLE: A = VERY UNSTABLE; B = MODERATELY UNSTABLE; C = SLIGHTLY UNSTABLE  
D = NEUTRAL; E = SLIGHTLY STABLE; F = MODERATELY STABLE  
G = VERY STABLE  
STAG INDEX..........................STAGNATION INDEX  
EXAMPLE: 0 = WINDS >= 10 MPH; 1 = WINDS <= 10 MPH WITH RAIN  
2 = DRY WITH DECENT WINDS  
3 = DRY WITH LIGHT WINDS AND STAGNATE CONDITIONS  
WATCH/WARNING/ADVISORY...  
EXAMPLE: W = WARNING; Y = ADVISORY; A = WATCH  
IN EFFECT FOR THE INDICATED HOUR  
 
DAY 4 THROUGH 7...  
 
MAX/MIN TEMP OR MIN/MAX TEMP (F)....MAXIMUM/MINIMUM AIR TEMPERATURE  
TEMP (F)............................AIR TEMPERATURE  
DEWPT (F)...........................DEW POINT TEMPERATURE  
RH (%)..............................RELATIVE HUMIDITY  
WIND DIR (8 POINT COMPASS)..........20 FT. WIND DIRECTION  
WIND SPD (MPH)......................20 FT. WIND SPEED  
AVG CLOUDS (CAT)....................AVERAGE CLOUD COVER CATEGORY  
POP 12HR (%)........................PROBABILITY FOR ACCUMULATING PRECIPITATION  
WEATHER...  
SEE DAY 1 THROUGH 3 WEATHER DESCRIPTIONS  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab TN Page
The Nexlab MS Page
The Nexlab AR Page Main Text Page